Manufacture of carbon black



Oct. 4, 1932. Q Ew15 1,881,084-

MANUFAGTURE oF CARBON BLACK Filed July 7, 1930 INVENTOR ATTORNEY Ypatented Oct. 4, 1932 Unirse srarss PATENT oFFlcEV GEORGE CHARLES LEWIS, OF NEW DORP, NEW YORK, ASSIGNOR T COLUMBIAN CARBON of COMPANY, 0F NEW YORK, N. Y., A CORPORATION 0F DELAWARE MANUFACTURE 0F CARBON BLACK Application filed July 7, 1930. Serial No. 466,066.

t This invention relatesito the manufacture of carbon black, and more particularly to a new and improved process and apparatus whereby a greater yield of carbon black hav- 5,1 ing improved characteristics is obtained.

, In certain processes of manufacturing carbon black, a hydrocarbon flame is impinged on one side of a carbon black depository such as anviron plate, and the deposited black subsequently removed. TheseV hydrocarbon flames with their associated depositories are confined in a shed or so-called hot house. VThe average temperature of such a hot house below the burner pipe may be approxi- 'mately'1000 to 1100o F., whereas the temperature'between flames may approximately be 1100 to 1250o F., this temperature varying according to the distance between the burner tips. Y

In accordance with the prese-nt invention, it

` has been found that if the ordinary temperature of the atmosphere in the hot house is raised above that ordinarily used, an appreciable increase in yieldV of' carbon black results. However, it is important that this lincrease in temperature of the hot house atmosphere should proceed without unduly affecting the quantity of air entering therein. If the draught of incoming air is checked or decreased,the interior of the ho-t house becomes dense with smoke which is not carbon blackV and the substance deposited on the plates has inferior and undesirable qualities.

On the other hand, when an eXcess of air enters there is less loss of carbon and smoke,

butan appreciable quantity of carbon in the flame, however, is consumed as CO and CO2. One way in which the temperature of this hot house7 can be raised above that ordinarily produced by the impingement of the r hydrocarbon flame alone is by means of the addition of heat from an external source. This may take the form of anv electrical heating system, va steam heating system or any other suitable heating system in which no gases of combustion are produced which would commingle with the atmosphere in the hot house. However, it is found preferable and more economical to maintain the temper- ,50 ature of the hot house at a high point by yplate which may take the form of a channel checking the radiation of the heat from the walls thereof. This can be done by insulating vthe outside walls of a metallic enclosure or by using an enclosure of non-ferrous construction. If a sheet metal wall is ut1l1zed,the ra- 5.-

vdiation thereof may be checked by providing a secondary wall with dead air space as insulation, or by' coating or lining the lwall with insulatingmaterial. f 'i y The invention further consistsy inthe new 6g and novel features of operation, andthe new `and original arrangement and combinations of steps 1n the process as well Aas original features of construction and combination of parts .hereinafterset forth andclaimed.

In the accompanying drawing y there is shown for purposes of illustration one apparatusby means of which the present process 'may be carried on. 4

In accordance with a concrete exemplilication of the present invention, there'is provided a shed 10 constructed of sheet metal'V material and having disposed therein a carbon black forming' apparatus including a 11. On the underside of said channel there are disposed a plurality of hydrocarbon flames 12 which impinge on said channel and which are emitted from a corresponding plurality of burners 13. The construction by means of which the channel 11 is moved and the carbon deposited thereon scraped off, forms no part of the present invention and the details thereof have been eliminated for the sake of simplicity.

In accordance with the present invention, the metal shed 11, in which the carbon black forming apparatus is enclosed has the outside wallsthereof insulated to check the radiation of the heat therefrom. The means for checking this radiation may take the form of a coating of asbestos 14: disposed in apposition to the walls of said shed 10. By checking the radiation of the heat from the walls of the shed,'the heat inside said shed can be more economically maintained at a higher temperature than would be the case if the amount of air entering the shed were a'ected. This increase in temperature produces a corresponding increase in yield, and the 100 `Althoughcertain novel features of the in- Atutions and changes in the Lseveral steps off quality of th'erca'rbon black'deposited'la's al result' thereof is of a much superior quality than that otherwise produced. However, it should be noted thatthe temperature in said metallic shed should notbe made to exceed a heat VVsuiicient to veffect such meta-1 parts of tie system as the burners, channels Iand the 1i e.

ventifon "have been 4Ash-own and described and are pointed out in the 'annexed claims, it will be'understood'that various omissions, substithe processl and in its opera-tion and in the form and detailsof the apparatusillustratedH 'I A* maybe made by lthose skilled in the art without departing *fromv the `spirit of .the inven- VHaving described my. invention, what Ivciailn as new and desire to secure by Letters Patent i'srfV f f1. The v"pross of manufacturing carbon Y* o v f black, wlrichaincludes impinging a ,hydro-' I' carbon lalnev on a metallic'plate, and retard ing ther radiation Voil-heat from the plate byy Y f enclosing theplate and flame in an enclosure having heat-insulated walls. l Y vQyAn; apparatus for manufacturing car-f bon -biackyincludin'ga metal plate, a burner forl producinga 'hydrocarbon iame iinpngingfonfsai-d plate', and an enclosure vfor said piatte and burner, 'said enclosure having .the

f walls thereof yinsulated against lheat radiaf tion. Y

Signed :at-NewYork in the county Vof New I Y' i York and "Statev of New York this 2nd day lof 

